Abstract
Treatment of 6,7-dialkoxy-1.4-dihydroquinoxaline-2.3-diones 3 with fuming nitric acid in acetic acid at 25 °C resulted in an acetoxylation reaction, giving 5-acetoxy-6,7-dialkoxy-1,4-dihydroquinoxaline-2 .3-diones 4 in moderate yields A mechanism involving ipso attack of nitronium ion as the first step is proposed.
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